Matéo, a teenager from a good family, is sick of being bullied and wants to buy a gun. He enlists the help of Karl, a childhood friend who has fallen in with bad company. During the deal, Matéo realizes that the rifle he wants will cost a lot more, and the situation quickly escalates.
Theo spends his 18th birthday alone, getting drunk at a brutal punk rock show. There, he meets Mag, a marginal teenager who invites him to spend the night at her place. A love story unfolds between them, but Theo has to move at the end of the summer in a small town, far away from a painful past.
Despite the fact that he is completely unrepentant about his crimes, when Regis Savoie's son asks to visit him, prison authorities grant permission for the boy to come. The thief and murderer (Gildor Roy) takes advantage of the moment of his son's arrival to steal a gun and take flight. He settles some old scores, gets together with his girlfriend, and heads for the hills, pursued by a detective who is not to be swayed in his efforts to follow and recapture him.